Howard County Police have confirmed 3 people dead at a suburban Baltimore mall, one of which who was located near a gun and ammunition is believed to be the shooter.

“We are very confident that it was a single shooter, that there is no other shooter in the mall,” Howard County Police Department Chief Bill McMahon said. “All of the activity took place at one time, in one store,” he said, leaving sources to believe it was a confined incident.

The Saturday morning shooting is being investigated as a possible domestic dispute involving a husband, his estranged wife, and her boyfriend, police sources told ABC News. Before confirming that, police are trying to make sure they have the correct identities of the deceased.

Police stated in a news release that no more shots have been fired following the discovery of the bodies. The scene was “believed to be secure” police said in a tweet at about 12:36pm.

Joan Harding of Elkridge, Md., was shopping for a tiara with her husband, David, for their granddaughter’s 18th birthday. She said she heard something heavy falling, followed by gunshots and people running.

“My husband said, ‘Get down!’ and the girl that worked in the store said, `Get in the back,’ ” Harding said. They hid until police gave the all clear.

Howard County General Hospital say they’ve received 5 patients, including 1 shooting victim. All sustained minor injuries and are said to be in good condition.

The Columbia Mall is at the center of the town, a suburb of both Baltimore and Washington.